Discharge chute attachment for symon vibrator screen



May 27, 1958 F. J. TOBIN 7 DISCHARGE CHUTE ATTACHMENT FOR SYMON VIBRATORSCREEN Filed Nov. 8, 1955 2 Sheets-Sheet l INVENTOR Francis John TobinATTORNEB' F. J. TOBIN May 27, 1958 DISCHARGE CHUTE ATTACHMENT FOR SYMONVIBRATOR SCREEN Filed Nov. 8, 1955 2 Sheets-Sheet 2 INVENTOR FrancisJohn Tobin BY W ATTORNEYs United States Patent DISCHARGE CHUTEATTACHIVIENT FOR SYMON VIBRATOR SCREEN Francis John Tobin, Yakima, Wash.

Application November 8, 1955, Serial No. 545,616

2 Claims. (Cl. 209-257) The present invention relates to discharge chuteattachment for Symon vibrator screen and is involved in the processingof sand and gravel to the end of screening and grading the same.

In the Symon machine a vibrating screen receives the gravel and due toits eccentric vibrating motion it imparts not only a shaking movement tothe gravel but also a motion of translation along the screen from areceiving end to a discharging end thereof. Incident to this movementthe sand and smaller rock are sifted through the meshes of the screen,leaving a residue of larger rock which must be disposed of. Heretoforethis residue has simply been discharged by gravity over the dischargeend of the Symon vibratory screen into a bunker, which has complicatedany further handling of this material and made it impossible to have thelarger residue or rocks elevated on conveyor lines.

It is an object of the present invention to provide a discharge chuteattachment with means to afiix the same to the vibrating Symon screen soas to partake of the movement thereof which chute is arranged to receivethe residue of rock at the end of the Symon screen and by reason of thevibrating action of the chute, the residue or rock is elevated over theeccentric drive at the end of the Symon screen onto a conveyor belt,from which point the residue or rock is carried to another or othervibrator screens where the same is re-screened and dumped into variousgrading hoppers.

It is another object of the invention to provide a chute in conjunctionwith a Symon vibratory screen, which chute will elevate the rock or byreason of its vibration vibrates the rock upgrade.

Heretofore it has not been feasible, particularly by conveyor beltmethods, to convey this rock upgrade. The rock being somewhat round willroll down the conveyor belt and it is simply not practicable to conveythis type of rock up hill on a conveyor belt.

It is therefore an important object of the invention to provide anupwardly inclined chute which will be vibrated back and forthlongitudinally whereby the rock delivered thereupon will, by virtue ofthe vibration, automatically cause the rock to vibrate uphill throughthe chute which is vibrating at all times.

It is a further object of the invention to provide a discharge chuteattachment of the kind described which will elevate rock from the Symonvibrator screen in a manner to by-pass the eccentric motion of thescreen so that the rock will not go through the crusher but will bedirected to segregation screens for sorting uncrushed rock for varioussizes.

With the foregoing and other objects in view, the invention will be morefully described hereinafter, and will be more particularly pointed outin the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views:

Figure 1 is a fragmentary perspective view of a Symon screening machinetaken from the discharge end of the 2,836,298 Patented May 27, 1958Symon vibrator screen and shown embodied thereina discharge chuteattachment constructed in accordance with the present invention.

Figure 2 is a similar view looking toward the discharge end of thevibrator screen and into the receiving end of the discharge chuteattachment of this invention.

Figure 3 is a fragmentary side elevational view of the Symon machinewith parts broken away and parts shown in section and with the dischargechute attachment incorporated therein.

Figure 4 is a perspective view of the discharge chute attachment of thisinvention illustrating a preferred form of application to the Symonvibrator screen.

Referring more particularly to the drawings, 10 designates a'Symonvibrator screen, which is eccentric driven and 11 represents a conveyorfor conveying the rocks to segregation screens or to a sorter or grader.

The improved discharge chute attachment comprises generally side walls12 and 13 and a bottom wall or plate 15 to which is affixed steel orother mesh screen 14. The side walls 12 and 13 may be connected togetherfor purposes of strength at or near their upper ends by a brace 16.Metallic or other straps 17, 13 are welded or otherwise affixed to theside walls 12 and 13, preferably in a diagonal direction so that in thsupported tilted'position of the chute these straps will extendrearwardly at elevations above the upper edges of the walls 12 and 13.The straps 17 and 18 have twists 19 therein so as to change the flatdimensions of these braces from the vertical position in which they areattached to the side walls 12 and 13 to a horizontal position forfacilitating the hooked ends 20 of the straps being passed about thescreen brace 21 which is a permanent portion of the Symon vibratorscreen. Bolts 22 or other fastenings may be employed to retain the freeends of the straps 17 and 18 upon the screen brace 21 as moreparticularly seen in Figure 3.

As appears to best advantage in Figures 2 and 4, the side walls orplates 12, 13 flare or diverge outwardly at the receiving end of thechute into wings 23 which produce a funnel mouth for the chute anddirect the rocks from the Symon screen into the chute, which latter isnarrower than the Symon screen. Bolts 24 and 25 may be passed throughthe wings 23 and into the side bars of the Symon screen for firmlyattaching the chute to the screen. Preferably at least two bolts areemployed at each side of the chute. v

Other bolts 26 pass through the floor or bottom or mesh of the chute andthrough the discharge end ofthe Symon screen. Preferably at least threeof the bolts261 are employed in this connection, making the number ofbolts employed to attach the chute to the Symon screen at least elevenwhich has been found to make a satisfactorily firm attachment forholding the screen in the inclined position shown in Figure 3 in whichits receiving end is lowermost and its discharge end is considerablyhigher. The bottom or bed of the chute including the mesh screen 14 isthus on an inclination requiring the rock to move up this inclined chuteby reason of the vibratory action and to be discharged ultimately at thehigh end of the chute on to an inclined apron 27 having side walls 28secured by appropriate fastenings 29 to the side walls 12, 13 of thechute. The apron 27 will deliver the rock to the conveyor 11 whence itwill be carried to the segregation screens.

The steel or other straps 17, 18 act as braces assisting to support theweight of the chute at its outer end from the brace 21 of the Symonscreen. The steel or other strap 17, 18 may be electrically welded tothe sides 12, 13 of the chute and are preferably not held by bolts. Inthis way elongated lengths of the members 17 and 18 are affixed to largeareas of the side walls 12 and 13.

. screen 10 which conveys or vibrates them to the entrance 5 of thedischarge chute attachment and with'the special speed of the screen therocks run uphill up tlfefchute and drop to the segregation screens forsorting of sizes vas needed for different specification jobs.

Q The vibratory movementthat is 'commun icatedto the chute is one backand forth lengthw'ise of 'such'chu'te as indicatedby the double heade'darrow in Figure 4. The

eccentrics'that produce this vibratory motion arerprefen ably 'arran edto produce a forward stroke of the chute which is in a direction fromits low to its high end in a continuous relatively fast uniform rate ofmovement by which the rocks will be carried -alon g-with-thechute. The i.return movement in the oppositedirection is however executed veryrapidly so that the'c hute virtually slides under the rocks leavingthemin the advanced position gained during the immediately-precedingvibratory stroke of the chute. T heinertia of the rocks will tend tokeep them moving in the directidnfrom 'the'discharge end of the screento the discharge end of the chute 'and the momentum acquired by theforward stroke of the chute will overcome any tendency of the rocks tomove back during the retrograde stroke of the chute or to roll down theinclined hottornwall of the chute.

The rocks go uphill in the-discharge chute attachment by reason of thevibrations. The vibratory movement screen, a vibration motion deviceconnected to the dismay, for; example, be set at 885 revolutions perminute,

in a back and forth motion. The rocks are lifted up the incline chute inorder to clear and convey the rocks over the eccentric drive of a Symonvibrating screen,

and the rocks are also lifted for the purpose of discharging the gravelfrom the level of the Symon screen to "a higher level, being theconveyor -11. v

, .Below the-screen 14 the bottom of the discharge chute attachment issolid. To this solid bottom 15 is welded or spot welded the mesh screencloth 14, for example of one-inch mesh. This mesh screen is used becauseit gives the necessary uplift or grip momentarily to the gravel or rockresulting in the same going up grade. The mesh screen is one type ofroughened or uneven surface for the chute which will give the necessarygrip.

The vibration of the Symon screen takes 'place by 'virtueof an electricmotor attached to the eccentric shaft. Both the Symon screen and thedischarge chute of this invention vibrate back and forth at the samerate of speed. As a result of this vibration and 'motion, rocks bouncealong up grade across the screen and up the chute over the eccentricdrive in and onto the higher level where the rock is taken to anotherpart of the processing plant.

Although I have disclosed herein the best form of the invention known tome at this time, I reserve the right 4 to all such modifications andchanges as may come within the scope of the following claims.

What is claimed is: 1. For use with a vibratory screen having adischarge end with a vibratory motion, device adjacent such dischargeend and a brace'at the discharge end portion of the screen, a chutecomprising an inclined bottom for rising over the device, means at thelower end of the' bottom for attaching the same 'to the discharge end ofthe screen, side walls erected on the bottom having outturned wings attheir lower ends for receiving material from the screen anddirectingth'esam'e to -thec'hute, straps affixed to the side walls ofthe chute and having portions shaped to engage the screen brace, and anapron extending downwardly from the high discharge end of the 1 chute.

2. For use with a vibratory screen for-receiving fines andcoarserjmaterials in which the fines are adapted to pass throughthe'rne'shes of the screen. and the coarser material rejected and heldsupported on the vibratory charge end of the-screen, a sc'reen'brace atthe discharge end portion 'of the s'c'ree'n and a segregation conveyorhaving its receiving 'end arranged on the opposite side of the devicefrom "the screen, a chute adapted to span the distance between thedischarge end of the screen and the receiving endof the conveyor and toelevate the coarser material over the vibration motion device, saidchute comprising an imperforate bottom of narrower Width thantheconveyor, a coarse screen mesh attached over'the imper forate bottom,sidejwalls erected at opposite sides'of the bottom 'andhaving outturnedWings at their lower ends overlying a portionof the discharge end of thescreen to deflect the coarser. material into the chute, fastening meansat the lower end of the bottom.

and through the wings adapted to attach the chute to the screen, "strapsafiixed to the side walls at the higher portions thereof and extendingover said wings and adapted to overli'e'the idischa'rge end ofthe-screen, said straps having hooks atthei'r free end portionsadaptedto engage with said screen brace, anda downwardly inclined apronaflixed to the higher discharge end of the chute-and overlying ther'ec'eiving'end of the conveyor References Cited in the fileof thispatent UNITED STATES PATENTS

